<template name="aui-picker">
	<view class="aui-picker" v-if="SHOW" :class="{
		'aui-picker-in': FADE==1,
		'aui-picker-out': FADE==0}"
	>
		<view class="aui-mask" @click.stop="close"></view>
		<view class="aui-picker-main">
	        <view class="aui-picker-header">
	            <view class="aui-picker-title" v-if="title">{{title}}</view>
	            <view class="aui-picker-close iconfont iconclose" @click.stop="close"></view>
	        </view>
	        <view class="aui-picker-nav">
				<view class="aui-picker-navitem"
					v-if="nav.length>0"
					v-for="(item, index) in nav" 
					:key="index" 
					:data-index="index" 
					:class="[index==navCurrentIndex ? 'active' : '', 'aui-picker-navitem-'+index]" 
					:style="{margin: nav.length>2 ? '0 10px 0 0' : '0 30px 0 0'}"
					@click.stop="_changeNav($event)"
				>{{item.name}}</view>				
				<view class="aui-picker-navitem"									
					:key="nav.length" 
					:data-index="nav.length"
					:class="[nav.length==navCurrentIndex ? 'active' : '', 'aui-picker-navitem-'+nav.length]" 
					:style="{margin: nav.length>2 ? '0 10px 0 0' : '0 30px 0 0'}"
					@click.stop="_changeNav($event)"
				>请选择</view>
				<view class="aui-picker-navborder" :style="{left: navBorderLeft+'px'}"></view>
			</view>
	        <view class="aui-picker-content">
	            <view class="aui-picker-lists">
					<view class="aui-picker-list"
						v-for="(list, index) in queryItems.length + 1"
						:key="index" 
						:data-index="index" 
						:class="[index==navCurrentIndex ? 'active' : '']"
					>
						<view class="aui-picker-list-warp" v-if="index == 0">
							<view class="aui-picker-item" 
								v-for="(item, key) in items" 
								v-if="item.pid=='0'"
								:key="key"
								:data-pindex="index"
								:data-index="key"
								:data-id="item.id" 
								:data-pid="item.pid"
								:data-name="item.name"
								:class="{'active': result.length>index && result[index].id==item.id}"
								:style="{'background': touchConfig.index==key && touchConfig.pindex==index ? touchConfig.style.background : ''}"
								@click.stop="_chooseItem($event)"
								@touchstart="_btnTouchStart($event)"
								@touchmove="_btnTouchEnd($event)"
								@touchend="_btnTouchEnd($event)"
							>{{item.name}}</view>
						</view>
						<view class="aui-picker-list-warp" v-else>
							<view class="aui-picker-item" 
								v-for="(item, key) in queryItems[index-1]"
								:key="key"
								:data-pindex="index"
								:data-index="key"
								:data-id="item.id"
								:data-pid="item.pid"
								:data-name="item.name"
								:class="{'active': result.length>index && result[index].id==item.id}"
								:style="{'background': touchConfig.index==key && touchConfig.pindex==index ? touchConfig.style.background : ''}"
								@click.stop="_chooseItem($event)"
								@touchstart="_btnTouchStart($event)"
								@touchmove="_btnTouchEnd($event)"
								@touchend="_btnTouchEnd($event)"
							>{{item.name}}</view>
						</view>
					</view>
				</view>
	        </view>
		</view>
	</view>
</template>

<script>
	export default {
		name: 'aui-picker',
		props: {
			title: { //标题
				type: String,
				default: ''
			},
			layer: { //控制几级联动,默认无限级(跟随数据有无下级)
				type: Number,
				default: null
			},
			data: { //数据 如：[{id: '', name: '', children: [{id: '', name: ''}]}]
				type: Array,
				default (){
					return [
						// [{id: '', name: '', children: [{id: '', name: ''}]}]
					]
				}
			}
		},
		data(){
			return {
				SHOW: false,
				FADE: -1,
				nav: [],
				items: [],
				queryItems: [],
				navCurrentIndex: 0,
				navBorderLeft: 40,
				result: [],
				touchConfig: {
					index: -1,
					pindex: -1,
					style: {
						color: '#197DE0',
						background: '#EFEFEF'
					} 
				}
			}
		},
		created(){
			const _this = this;
		},
		watch:{
			data(){
				const _this = this;
				const data = _this.data;
				_this.items = _this._flatten(data, '0')
	　　　　}　　
	　　},
		mounted(){
			
		},
		methods:{
			// 打开
			open(){
				const _this = this;				
				_this.reset(); //打开时重置picker
				return new Promise(function(resolve, reject){
					_this.SHOW = true;
					_this.FADE = 1;
					resolve();
				});
			},
			// 关闭
			close(){
				const _this = this;
				return new Promise(function(resolve, reject){
					_this.FADE = 0;
					const _hidetimer = setTimeout(()=>{
						_this.SHOW = false;
						_this.FADE = -1;
						clearTimeout(_hidetimer);
						resolve();						
					},100)	
				});
			},
			//重置
			reset(){
				const _this = this;
				_this.queryItems = [];
				_this.nav = [];
				_this.navBorderLeft = 40;
				_this.navCurrentIndex = 0;
				_this.result = [];
			},
			//导航栏切换
			_changeNav(e){
				const _this = this;
				const index = Number(e.currentTarget.dataset.index);
				_this.navCurrentIndex = index;
				const _el = uni.createSelectorQuery().in(this).select(".aui-picker-navitem-"+index);
				_el.boundingClientRect(data => {
					_this.navBorderLeft = data.left + 20;
				}).exec();
			},
			//数据选择
			_chooseItem(e){
				const _this = this;
				const id = e.currentTarget.dataset.id;
				const name = e.currentTarget.dataset.name;
				const pid = e.currentTarget.dataset.pid;
				const _arr = [];
				_this.result[_this.navCurrentIndex] = {id: id, name: name, pid: pid};
				if(
					(!_this._isDefine(_this.layer) && _this._isDefine(_this._deepQuery(_this.data, id).children)) 
					|| 
					(_this.navCurrentIndex < (Number(_this.layer) - 1) && _this._isDefine(_this._deepQuery(_this.data, id).children))
				)
				{ //有下级数据
					_this._deepQuery(_this.data, id).children.forEach(function(item, index){
						_arr.push({id: item.id, name: item.name, pid: id});
					});
					if(_this.navCurrentIndex == _this.queryItems.length)
					{ //选择数据
						_this.queryItems.push(_arr);
						_this.nav.push({name: name});
					}
					else
					{ //重新选择数据
						_this.queryItems.splice(_this.navCurrentIndex+1, 1);
						_this.nav.splice(_this.navCurrentIndex+1, 1);
						_this.queryItems.splice(_this.navCurrentIndex, 1, _arr);
						_this.nav.splice(_this.navCurrentIndex, 1, {name: name});
					}
					_this.navCurrentIndex = _this.navCurrentIndex + 1;
					const _el = uni.createSelectorQuery().in(this).select(".aui-picker-navitem-"+_this.navCurrentIndex);
					setTimeout(()=>{
						_el.boundingClientRect(data => {
							_this.navBorderLeft = data.left + 20;
						}).exec();
					},100)
				}
				else
				{ //无下级数据
					_this.close().then(()=>{
						_this.$emit("callback", {status: 0, data: _this.result});
					});
				}
			},			
			//递归遍历——将树形结构数据转化为数组格式
			_flatten(tree, pid) {
				return tree.reduce((arr, {id, name, children = []}) =>
				arr.concat([{id, name, pid}], this._flatten(children, id)), [])
			},
			//根据id查询对应的数据(如查询id=10100对应的对象)
			_deepQuery(tree, id) {
			    let isGet = false;
			    let retNode = null;
			    function deepSearch(tree, id){
			        for(let i = 0; i < tree.length; i++) {
			            if(tree[i].children && tree[i].children.length > 0) {
			                deepSearch(tree[i].children, id);
			            }
			            if(id === tree[i].id || isGet) {
			                isGet||(retNode = tree[i]);
			                isGet = true;
			                break;
			            }
			        }
			    }
			    deepSearch(tree, id);
			    return retNode;
			},
			/***判断字符串是否为空
			   @param {string} str 变量
			   @example: aui.isDefine("变量");
			*/
			_isDefine(str){
				if (str==null || str=="" || str=="undefined" || str==undefined || str=="null" || str=="(null)" || str=='NULL' || typeof (str)=='undefined'){
					return false;
				}else{
					str = str + "";
					str = str.replace(/\s/g, "");
					if (str == ""){return false;}
					return true;
				}
			},
			_btnTouchStart(e){
				const _this = this,
					index = Number(e.currentTarget.dataset.index),
					pindex = Number(e.currentTarget.dataset.pindex);
				_this.touchConfig.index = index;
				_this.touchConfig.pindex = pindex;
			},
			_btnTouchEnd(e){
				const _this = this,
					index = Number(e.currentTarget.dataset.index),
					pindex = Number(e.currentTarget.dataset.pindex);
				_this.touchConfig.index = -1;
				_this.touchConfig.pindex = -1;
			},	
		}
	}
</script>

<style scoped>
	/* ====================
		多级联动弹窗
	 =====================*/
	 @import url("./common/aui/css/aui.css");
	 @import url("./common/aui/css/aui.iconfont.css");
	.aui-picker{
		width: 100vw;
		height: 100vh;
		opacity: 0;		
		position: fixed;
		top: 0;
		left: 0;
		z-index: 999;
		/* display: none; */
	}
	.aui-picker.aui-picker-in{
		-moz-animation: aui-fade-in .1s ease-out forwards;
		-ms-animation: aui-fade-in .1s ease-out forwards;
		-webkit-animation: aui-fade-in .1s ease-out forwards;
		animation: aui-fade-in .1s ease-out forwards;
	}
	.aui-picker.aui-picker-out{
		-moz-animation: aui-fade-out .1s ease-out forwards;
		-ms-animation: aui-fade-out .1s ease-out forwards;
		-webkit-animation: aui-fade-out .1s ease-out forwards;
		animation: aui-fade-out .1s ease-out forwards;
	}
	.aui-picker-main{
		width: 100vw;
		height: 50vh;
		background: #FFF;
		border-radius: 15px 15px 0 0;
		position: absolute;
		left: 0px;
		bottom: -50vh;		
		z-index: 999;
	}
	.aui-picker.aui-picker-in .aui-picker-main{
		-moz-animation: aui-slide-up-screen .2s ease-out forwards;
		-ms-animation: aui-slide-up-screen .2s ease-out forwards;
		-webkit-animation: aui-slide-up-screen .2s ease-out forwards;
		animation: aui-slide-up-screen .2s ease-out forwards;
	}
	.aui-picker.aui-picker-out .aui-picker-main{
		-moz-animation: aui-slide-down-screen .2s ease-out forwards;
		-ms-animation: aui-slide-down-screen .2s ease-out forwards;
		-webkit-animation: aui-slide-down-screen .2s ease-out forwards;
		animation: aui-slide-down-screen .2s ease-out forwards;
	}
	.aui-picker-header{
		width: 100%;
		min-height: 50px;
		position: relative;
		z-index: 999;
		background: #F2F2F2;
		border-radius: 15px 15px 0 0;
	}
	.aui-picker-header::after{
		content: '';
		width: 100%;
		height: 1px;
		background: rgba(100,100,100,.3);
		-moz-transform: scaleY(.3);
		-ms-transform: scaleY(.3);
		-webkit-transform: scaleY(.3);
		transform: scaleY(.3);
		position: absolute;
		left: 0;
		bottom: 0;
		z-index: 999;
	}
	.aui-picker-title{
		line-height: 20px;
		text-align: center;
		font-size: 17px;
		color: #333;
		padding: 15px;
		box-sizing: border-box;
		position: absolute;
		left: 50px;
		right: 50px;
		top: 0;
	}
	.aui-picker-close.iconfont{
		width: 50px;
		height: 50px;
		line-height: 50px;
		text-align: center;
		font-size: 20px;
		color: #aaa;
		border-radius: 0 10px 0 0;
		position: absolute;
		right: 0;
		top: 0;
	}
	.aui-picker-content{
		width: 100%;
		height: -webkit-calc(100% - 100px);
		height: calc(100% - 100px);
	}
	.aui-picker-nav{
		width: 100%;
		height: 50px;
		text-align: left;
		padding: 0 20px;
		margin: 0 0 1px 0;
		justify-content: flex-start;
		white-space: nowrap;
		box-sizing: border-box;
		position: relative;
	}
	.aui-picker-nav::after{
		content: '';
		width: 100%;
		height: 1px;
		background: rgba(100,100,100,.3);
		-moz-transform: scaleY(.3);
		-ms-transform: scaleY(.3);
		-webkit-transform: scaleY(.3);
		transform: scaleY(.3);
		position: absolute;
		left: 0;
		bottom: 0;
		z-index: 999;
	}
	.aui-picker-navitem{
		width: 80px;
		line-height: 50px;
		font-size: 16px;
		margin: 0 30px 0 0;
		text-align: center;
		display: inline-block;
		overflow: hidden;
		white-space: nowrap;
		text-overflow: ellipsis;
	}
	.aui-picker-navitem.active{
		color: #197DE0;
	}
	.aui-picker-navborder{
		width: 40px;
		height: 3px;
		background: #197DE0;
		border-radius: 5px;
		transition: left .15s;
		position: absolute;
		left: 40px;
		bottom: 0;
	}
	.aui-picker-lists{
		width: 100%;
		height: 100%;
		justify-content: space-around;
		white-space: nowrap;
	}
	.aui-picker-list{
		width: 100%;
		height: 100%;
		overflow: hidden;
		overflow-y: scroll;
		display: none;
		vertical-align: top;
	}
	.aui-picker-list.active{
		display: inline-block;
	}
	.aui-picker-list-warp{
		width: 100%;
		height: auto;
		box-sizing: border-box;
		padding: 15px 0;
		display: inline-block;
	}
	.aui-picker-item{
		width: 100%;
		height: 50px;
		line-height: 50px;
		padding: 0 15px;
		box-sizing: border-box;
		font-size: 15px;
		color: #333;
		position: relative;
	}
	.aui-picker-item.active{
		color: #197DE0;
	}
	.aui-picker-item.active::after{
		content: '✔';
		font-size: 15px;
		color: #197DE0;
		position: absolute;
		top: 0px;
		right: 10px;
	}

</style>
